nac3/nix/llvm/llvm-future-riscv-abi.diff

diff --git a/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp b/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
index 0aba18b20..9bb75e7f4 100644
--- a/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
+++ b/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
@@ -33,6 +33,8 @@ ABI computeTargetABI(const Triple &TT, FeatureBitset FeatureBits,
   auto TargetABI = getTargetABI(ABIName);
   bool IsRV64 = TT.isArch64Bit();
   bool IsRV32E = FeatureBits[RISCV::FeatureRV32E];
+  bool IsRV32D = FeatureBits[RISCV::FeatureStdExtD];
+  bool IsRV32F = FeatureBits[RISCV::FeatureStdExtF];
 
   if (!ABIName.empty() && TargetABI == ABI_Unknown) {
     errs()
@@ -56,10 +58,10 @@ ABI computeTargetABI(const Triple &TT, FeatureBitset FeatureBits,
   if (TargetABI != ABI_Unknown)
     return TargetABI;
 
-  // For now, default to the ilp32/ilp32e/lp64 ABI if no explicit ABI is given
-  // or an invalid/unrecognised string is given. In the future, it might be
-  // worth changing this to default to ilp32f/lp64f and ilp32d/lp64d when
-  // hardware support for floating point is present.
+  if (IsRV32D)
+    return ABI_ILP32D;
+  if (IsRV32F)
+    return ABI_ILP32F;
   if (IsRV32E)
     return ABI_ILP32E;
   if (IsRV64)